You can't!
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Unless you could walk through walls you can't go behind the boxes.
because the cry matches the Pokemon that you have unlocked in your pokedex and if you see the boxes in seven island and match the cry you will move the box and unlock 8 island.
to get through you need an e-reader and behind the boxes is a programmed trainer.
You have to have an e-reader. the e-reader game is behind them.
You can't, these boxes are unpassable, (you can't pass even with gameshark) But if they are unpassable, then why is it saying there is a wind from behind it...